Push Mower Drive Motor Cutoff for Back-Driven Energy Isolation
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Solution Overview
Problem
In self-propelled garden tools like push mowers, the traveling motor can generate motor energy when driven by an external force, which can discharge back and cause abnormal conditions or damage to the machine.
Innovation Solution
A controller is configured to cut off the electrical energy transmission path of the traveling motor when it is driven by an external force to generate motor energy, preventing this energy from supplying power to the cutting motor and potentially damaging components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the traveling motor is allowed to generate motor energy when driven by external force, then energy recovery is possible, but the motor energy may discharge back to the control board causing abnormal conditions or damage
Solution Approach 1:
A diode is introduced as an intermediary component in the electrical circuit between the traveling motor and the control board. The diode allows current to flow in only one direction, enabling the traveling motor to generate and store motor energy when driven by external force while blocking any reverse current from discharging to the control board, thus protecting the control board from damage
Solution Approach 2:
The harmful reverse current discharge path is extracted and isolated from the control board circuit. By separating the energy recovery path from the control circuit through the diode, the system allows energy recovery while preventing the harmful effect of reverse current from reaching the control board
2Loss of energy
If the traveling motor generates motor energy during operation, then energy can be recovered, but the motor energy may cause abnormal operations or damage to the cutting motor
Solution Approach 1:
A diode is placed in the circuit path between the traveling motor and the cutting motor to act as an intermediary. This diode permits the traveling motor to generate motor energy during external force-driven operation while blocking the reverse current from reaching and potentially damaging the cutting motor
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution effectively prevents the motor energy generated by the traveling motor from causing abnormal operations or damage to the cutting motor and other components, ensuring safer and more reliable operation of the garden tool.
Implementation Method 1
The traveling motor is drivable by an external force to generate a motor energy
Data Source
AI summary
A push mower includes a body including at least a traveling assembly, a traveling motor driving the traveling assembly, a cutting assembly, and a cutting motor driving the cutting assembly; a handle device connected to the body and including at least an operating member for a user to operate; a controller configured to control at least the working states of the traveling motor and the cutting motor; and a power interface for connecting a power supply energy capable of supplying power to at least the traveling motor and the cutting motor. The traveling motor is drivable by an external force to generate a motor energy. The controller is configured to, when the traveling motor generates the motor energy, cut off an electrical energy transmission path of the traveling motor.